implement ADD Vx, Vy

1 files changed, 8 insertions, 0 deletions

diff --git a/src/chip8.rs b/src/chip8.rs
index 22c8570..8dca81e 100644
--- a/src/chip8.rs
+++ b/src/chip8.rs
@@ -122,6 +122,14 @@ impl Chip8 {
                     eprintln!("XOR V{}, V{}", x, y);
                     self.v[x] = self.v[x] ^ self.v[y];
                 }
+                0x0004 => {
+                    eprintln!("ADD V{}, V{}", x, y);
+                    let vx = self.v[x] as u16;
+                    let vy = self.v[y] as u16;
+                    let v = vx + vy;
+                    self.v[0xF] = if v > 255 { 1 } else { 0 };
+                    self.v[x] = v as u8;
+                }
                 _ => unknown_opcode(opcode),
             },
             0x9000 => {